EOtech AA battery LED pistol light??
 

Personally I hate CR batteries. They're expensive and not so,etching I consider easy to find if I need them on the spot. I tonight see eotech has a AA weapon light so I co,e here and hit the search tab, seems like nobody has one. I'm hoping I missed it or nobody mentioned buying one and looking for reviews

http://www.eotech-inc.com/products/lights/wl1aa

The suggested retail of $249.00 might be a reason you don't see too many people with one when you can pick up a TLR-1 for just over a hundred.

While I too hate the CR batteries that thing looks way too long for a pistol. Now a rifle it would work for some. I also don't imagine there are any holsters yet to accommodate the light left on a pistol. I add that I haven't look either so if there is one then it's because I didn't bother looking.